William Harvey — "The circulation of the blood is a new doctrine, and I doubt not but it will meet…"
The circulation of the blood is a new doctrine, and I doubt not but it will meet with its opponents.
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More from William Harvey
"The heart is the sun of the microcosm."
"The quantity of blood transmitted from the veins to the arteries, and so into the whole body, is so great that it must return to the heart."
"The semen is the efficient cause and the egg the material cause of generation."
"I appeal to the evidence of my senses, and to the testimony of dissections."
"The greatest pleasure is to discover something new."
About William Harvey (1578-1657)
English physician whose On the Motion of the Heart and Blood in Animals (1628) demonstrated blood circulation, overturning 1,400 years of Galenic medicine. Closely associated with Francis Bacon (his contemporary in the new English empiricism). For an intellectual contrast, see Galenic medicine, the 2nd-century Greek medical tradition (humors, blood-as-consumed-fuel) — Harvey calculated that the heart pumps more blood per hour than the body could possibly produce as fuel — a single quantitative observation that demolished the entire Galenic-Aristotelian medical worldview. The cleanest example in medical history of arithmetic disproving 14 centuries of authority.
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Understanding this quote
What it means
A new idea will always face resistance from those who benefited from or believed in the old way of thinking. Harvey acknowledges that challenging established knowledge invites pushback, but the truth of discovery doesn't depend on immediate acceptance. Progress requires courage to assert findings even when they contradict centuries of received wisdom that powerful institutions and respected authorities have built their reputations upon.
Relevance to William Harvey
Harvey spent decades carefully experimenting before publishing De Motu Cordis in 1628, proving blood circulates continuously rather than being consumed by tissues as Galen taught. He personally endured ridicule from contemporaries, lost patients who distrusted his heterodox views, and watched colleagues dismiss quantitative anatomical evidence. His prediction proved accurate — fierce opposition lasted years before circulation became accepted medical fact.
The era
Early 17th-century medicine was dominated by Galenic humoral theory, unchallenged for 1,400 years and institutionally enforced by universities and royal colleges. The Scientific Revolution was just gaining momentum — Galileo faced the Inquisition, Vesalius had already challenged anatomy orthodoxy and paid professionally. Questioning ancient authorities was culturally dangerous, making Harvey's calm, evidence-based defiance of Galen an act of considerable intellectual and professional courage.
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